Tank filling limiter

Abstract

A limiter for the filling of a tank with any liquid, comprising a hydraulic valve provided with a monitoring obturator connected to a first arm with a first float included in an arm-control assembly of which a second arm with a second float cooperates with said first arm through a stop and pawl arrangement, the position of the first arm controlling said obturator, the latter comprising a diaphragm acting as well under an impulse from said first arm as by a permanent action. The limiter provides for safe filling of a tank between predetermined levels without any water-hammer and overflow.

What is claimed is: 
     
       1. A limiter for the filling of a tank with liquid, mounted in said tank, comprising: a hydraulic valve provided with a monitoring obturator means having a control flap and a control axle connected to a first pivoting arm having a first float included in an arm-control assembly;   a second pivoting arm having a second float and a peg cooperating with a cam disposed at the end of said first arm opposite said first float;   a fixed member on said control axle comprising a stop and pawl arrangement with a perpendicular flat spring urging a finger disposed on said pawl and pivoting onto said second arm, said finger being in escaping relationship with respect to said flat spring;   said hydraulic valve comprising a body provided with an inlet flange and an outlet flange, a cylinder and a movable piston provided with an inner cavity and bearing on a seating disposed at the vicinity of said outlet flange;   and means for placing said inner cavity and the downstream side of said obturator means in communication with said tank.   
     
     
       2. A limiter according to claim 1 in which said movable piston bears on a seating extended through a dip tube arranged in the tank and the obturator means is constituted by a diaphragm cap with elastic return urging it into open position, of which the downstream side includes a needle valve in a first passage for placing the inner cavity of the piston in communication with the tank through a first channel, said obturator means comprising a second passage for placing said tank and said downstream cavity of the cap in communication, the latter being mounted on a rod itself bearing at its end opposite the needle valve on said control flap of said obturator associated with said first pivoting arm. 
     
     
       3. A limiter according to claim 1 in which said stop and pawl arrangement comprises the cam at the end of the first arm which can come into abutment on a peg borne by the second arm, the member fast to the axle of said first arm and provided with a stop and with the flat spring on which is supported with possible passage past it a finger of the pawl, itself with an elastic return limited by a stop supported on an edge of said first arm, the finger being contactible with the stop of the member fast to said axle after passage past said flat spring on the rise of the second arm under the action of the second float. 
     
     
       4. A limiter according to claim 1 in which the control flap of the obturator of the hydraulic valve associated with the first pivoting arm is fast to the pivoting axle of the first arm and on which is fixed the part cooperating with the pawl. 
     
     
       5. A limiter according to claim 1 in which the obturator control flap of the hydraulic valve is associated with the first pivoting arm through a linkage capable of transmitting a rotary movement of the axle of said flap, the hydraulic valve being distant from the pivoting arm-control assembly.